Hangman Rewrite

src/NadekoBot/Modules/Games/Common/Hangman/DefaultHangmanSource.cs

@@ -0,0 +1,72 @@
+#nullable enable
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+using System.Linq;
+using NadekoBot.Common;
+using NadekoBot.Common.Yml;
+using Serilog;
+
+namespace NadekoBot.Modules.Games.Hangman
+{
+    public sealed class DefaultHangmanSource : IHangmanSource
+    {
+        private IReadOnlyDictionary<string, HangmanTerm[]> _terms = new Dictionary<string, HangmanTerm[]>();
+        private readonly Random _rng;
+
+        public DefaultHangmanSource()
+        {
+            _rng = new NadekoRandom();
+            Reload();
+        }
+
+        public void Reload()
+        {
+            if (!Directory.Exists("data/hangman"))
+            {
+                Log.Error("Hangman game won't work. Folder 'data/hangman' is missing.");
+                return;
+            }
+
+            var qs = new Dictionary<string, HangmanTerm[]>();
+            foreach (var file in Directory.EnumerateFiles("data/hangman/", "*.yml"))
+            {
+                try
+                {
+                    var data = Yaml.Deserializer.Deserialize<HangmanTerm[]>(File.ReadAllText(file));
+                    qs[Path.GetFileNameWithoutExtension(file).ToLowerInvariant()] = data;
+                }
+                catch (Exception ex)
+                {
+                    Log.Error(ex, "Loading {HangmanFile} failed.", file);
+                }
+            }
+
+            _terms = qs;
+            
+            Log.Information("Loaded {HangmanCategoryCount} hangman categories.", qs.Count);
+        }
+
+        public IReadOnlyCollection<string> GetCategories() 
+            => _terms.Keys.ToList();
+
+        public bool GetTerm(string? category, [NotNullWhen(true)] out HangmanTerm? term)
+        {
+            if (category is null)
+            {
+                var cats = GetCategories();
+                category = cats.ElementAt(_rng.Next(0, cats.Count));
+            }
+
+            if (_terms.TryGetValue(category, out var terms))
+            {
+                term = terms[_rng.Next(0, terms.Length)];
+                return true;
+            }
+
+            term = null;
+            return false;
+        }
+    }
+}